Grate



Jan. 19,119,321

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@odxmgf @04h06 1CD-GQ'. Q. @0. J@ www Jan. 19 1932. A LORENZ, JR` Y 1,841,374

GRATE Filed Feb. ll, 41929 2 Sheets-Sheet 2 Y l5 tion, thereV must be an'open@space.between` Y heating of the grate bar structure. 'llheusualj -4 f of expansion and contraction ingtheacasting Patented `lan. 19, 1932 YUmm FREDERICK A. LORENZ, ma, oFcHIeAGo, "ILLINoIsfns-sreron To AMRIcArisTiEEnfr FoUNDmEs, or fcrt1oAGo,"1LL1No1s, A companion orffNEwi JERSEY @RATE der thatthegratebar may last 'aslong as pos-'T' sible and yet be remove Y a lbreksakagefon the road wouldcause engine failureff 'i j fi'rff It is therefore desirableto designa'gra'te'j This invention pertains to gratesfl and more particularly to the'dumping orrocliing type of ymultiple 'section grates used inldco ..l motive fireboxes orthe like..y 5`V vThere are special requirements fo'ngrates to beused in locomotive service," Whichrequirements are peculiar to that service alone and which must be 'eonstantlybornein' mind to produce a successfuldevice",y espe'- 0` cially as. there is an increasing tendencyffor long runs. j One of these requirements is that the lgrates ymust beloffsuflcient Width to al. .low rapidi cleaningof the tlrey` Inf other 3 Words, when theV gratesfare in dumping posi-V with `and supports the' fuel Abed,"saidtop ,be-

a carrying-member lwould* practically" be ap'e'r-k 1 marient part ofthe locomotivawhile: thet'opf` i placement.

- It-:is tlierefo inexpensive-to build and; maintain, and onel which fulfills vall'of the above enumerated re them large enough toffr'eely pass all clinkers quirements for economicalrnaintenance and which havebeen formed;- ltfis not uncommon to replace locon'lotivek grate barsfrom gtime to time, the most commonvcause forreiy 2U placement being-fone:I burning ofthe top surface of the grates, and tufo i thermal cracks appearingin the top Ys'urfaceofthegrates, j-

Burning or cracking ofcourse necessitates 3 the removalofthe entire gratebar so burned 2f orcracked andisdue to the fire. coming into,y

successful` operation. p v n x `Anotherobject is. to provide a gr assembly y whicheffectively resists distortion,

t p assembly Whiehaffords,substantially no V11e-' direct Contact Witlrthe `metaljof thefloar.'l The temperature of the lire being ffar aboife' theJ same time-isfixjedly supported the fusing temperature 'of;` the metal usually tively resistsWarpingandtwisting. 1 f: used for these grate bars, .large holesarerpro-j duced in the bars which in turn produce holesv ,assembly wherein the securing *members -be-'-y inthe rewhch are' Very detti-mental .1501 tween'parts arereduce'd tea; minimumiandproper"cc'n'nbustionVA L,

Thermal cracksv-vare .caused by. unequal andfarrangV design of structure `has atop surfacetols'up-` port the fuelv and admit air to-theffuel.k bed, the ystructure being strengthened on the unkder side by deep ribsfcast integral ,Withthe 4 top,and theftop vsurfaceis oftenlin direct corr-v taC fWh the i'e While-h'eSSIGIIghQHIIgQ expansion-and contraction, andiinallyonez Y ribs are kept Hcomparatively cool bythe rush@^ tvhichis inexpensive topfoduc 4 ofair through the gratelbar to the lfire .This, i produces a Very unequal and` bad'vCOnditiQn being? adapted for-,the uniformfallllsfsion face oftheassembly. Oncethelora'cls are Pairfthroughsaid'plate forpropercombustion, started, it is only-a question of time las'.t",o-; thelplatebeing ofyuniform-"thicknessyeti'as" when` theywill extend all theway throughf-` thinasco'nsistent strengthand rigidity;

50 the. casting, and `forthis reasongrates inustf tothe',endthatfthejshrinkagestresses"areref` be inspected 'Very Vclosely at lterminals in or duced'toj'a-fminiinum;yFurther, the plate `is` resulting in thermalcracks inthetopgsurf` suuaaother Objectis! to"pievidefagrtl f d before it, breaks,as?y

55 Y' bar with a separate topL whichris in contact y jing vsupportedon al carrying rmember," and this i could becheaplyandquicklyr movedfor reg-jf 1 il c realli rofthe presentl i, vention to .provide va grate vassembly Whichis is "readily'freinoyfable and"ffperinits't4 rapidf l cleaning .ofthe fireand .changesi f ofthe grate Y ,v

sistance toexpansion andfeontraction, 'yet at, 1

and effeQ-a 1 Yet another, object'istokprovide agraf-ff Y 30 t' Y Y wherein the?V clearances" .are predetermined ldto permit ease of operation, as-- e, provide'a gratter 18.5' j frame or.`load*carrying member Whichiis Jofafy n Y, amplestrengthf, is air cooled to the greate'st f possible'degree, isdesignedtoi-holdthe top'.

plates ifirmly` in place andyet allows for-full1 9b* fulllingtheqa Vezrequirementsgsaidplate designed for free expansion and contraction Without affecting the frame, is of such character that the production :variations do not materially afi'ectthe proper function or firinness of the fastenings oi' the top to the t'ram'c,

l and the plate is oi' such character as is easily Y and inexpensively removed and replaced.'

. erence characters are used to designate like by the line 3 8 of Figure parts-` Fieure l is ato )lan view ot a O'rate assembly embodying-the invention, said view show- IingY .the relationo'f the supportingframe .to

one of the grate plates;

FiO'ure 2 is a si leelevation oi' the assembly shown in Figure 1; Y

Figure 3 is an enlarged sectionaleiid elcvation of the grateassembly, the same being.

taken substantially inthe plane as indicated 2; Y Figure 4 is an enlarged elevation of a portion ot the Ygrate plate, showing one of the locking members;

' Figure 5 is a top plan vien'. of a modified form of grateasseinbly embodying the invention, said View yshowing the relation of the supporting frame to one of the grate plates;

Figure Y shown in Figure 5; and y Figure 7 is an enlargedend.sectionalelevationof the gratevassembly, the'same being I taken substantially inthe plane as indicated by the line .7-7 of Figure'. y

Referring iirst of all more particularly to themodification.illustratedin Figures l to 4'inclusive, the grate assembly includes a supporting frame and any number of grate plates .-(sh oWn 2.) vwhich are releasably secured to The frame i0 consists essential-V saidrame. lyV of a pairo spaced parallel ribs' or sup*- portingv members l2, truss shape, that is,

thereof in. order Vto closely-approximate1a. beamY of uniform` stress for" a, uniformly distributed Yload.- Ribs'12 terminate at their ends indu--v tegral trunni'ons 14 of either the soclretor horseshoeY type, `or V.preferably onesotsaid trunnions 1 6 is of the socket type while the.Y

other oi said truniiionsV 18 is oi the horseshoe type. The ribs may also'bef provided with any `number of spaced integralcrossineni# Y bers 20 to forni a more rigi structure',` `Each 1 Y .f l f l of said ribs 121s proyided with `fastening means for the lgrate plates, which nit-'iansin` clude pairs of spacedlugs 22,Y said lngsfon each of'said ribsbeing preierablygaligned elevation,

4fragmentary side i 'whereby 6 is a side elevation ot the assembly shown of substantgi ally i the greatest ldepth K of the ribs is'disp'osed adjacent the center with corresponding lugs on the other of said ribs. i

The grate plates or table grates 24, provided With round or other suitably shaped apertures 26, may be convex in section and may be provided with a marginal rib 28 eX- tending around the plate, said rib and said plate being integral with a longitudinal rib 30 disposed on the concave side of the plate, a. :cross rib 32 being preferably terniediate the rlength, of said Vplate and integral Wit-lr the ribs 28 and 30. The plate and rib Aare provided With spaced downwardly projecting locking lugs 34 and 36 on the opposite sides Vof the center rib 30, said lugs being adapted to havecooperative, engagement with the lugs 22.. Lug 84 is preterablyl substantially inverted T-shaped Yin beingprovidedwith a shank 38 and a head 40 comprising oppositely extending arms', said arms being adapted to extend beneath and with pairs Vof the spaced lugs 22 provided on the supporting ribs of the frame. Lug 36 ispreferabl7 longer than thejlug 84 and .provided in-.j

isfprovided with an apertureor leywayf42.

disposed Ybeneath the lugs 22 in assembly,

plate inz-its operative position. plates may be placedl in their respective -positions in a similarVV manner.

' Itwillbeseen that with such an assembly the plates are locked in position at a plurality of points on op'positesides of the frame, and supporting engagement between the plates Yand the fra-meis maintained' at aplurality of.

V"Referring now moreparticularly vto the modification illustrated in Fif'guresv 5Y to 7 inclus-ive, it will be seen that the assembly includes a supporting frame and any number `(shown 2) of grate plates. The'supporting frame yconsists essentially of a pairvof spacedv longitudinally extending parallelv ribs 50 of substantiall truss shape, `fsa'idf` ribs being formed integrally ',with Y1suitable trunnions -52 disposed at either end ofthe "frame, and

y Cotter pin or key' 4 4V niayb'e'inf` serted in the lreyway 42 for locking said The' other integralcrossties orribs 54 may be provided :at suitable intervals.intermediate the ends thereof; The assembly shown is'ior a pair of Urateplates Vthoughiiti's to be understood that an assembly'of any number'of said plates is contemplated.V

In the present instances, it is 'desirable to lock each of the'plates in its operative positioiiivith respect to the rame'at aplurality 'of points, and thisY is Vdone by providing preferably of arcuate i skilled inthe art without i spaced. parallel members and i looking members including t be made in armanner similar'to the vided with claim: i i j 1. In a grate assembly, the combinationy fra-nie, said frame including having locking members havin the `frame 50 with inwardly ,extending being shown with l on said frame, saidniembers each having Ldepending .locking` embers having cooper-- positioning means, i said locking members including members` spaced lugs 56, said lugs an aperture 58 -for the reception of a locking member provided on the grate plate. lVhileV these lugs 56 are shown as closed members provided with apertures, they of course may already described. rIhe grate plate 60 is shown is provided ing Contact with the frame and withA the as at 64 and may also be proa longitudinally extending ribk 66 and a transversely extending rib 68, said ribs 66 and 68 being integral with the other, the marginal liange'62,` and with the plate. The under side or convex side of the plates is provided with depending lugs 70, vsaid lugs being adapted to extend through the apertures 58 when the plates areassembled` with theframe, and each: of said lugs is shown as provided with a keywa y72 adapted for apertured the reception ofthe key 74 yfor releasably locking said plates in operativeposition.

In assembling the frame, each plate is of course merely dropped into position, the 'lugs 70 extending through theV apertures 58, whereupon theA keysmay be inserted in their respective keyways 72 the plates in their operative position. i It will be seen that with lthe above assembly that a very compact and advantageous structure is provided, and

stood that I do not wish to be limited bythe exact embodiment ofthe device shown, which is merely byway offillustration 'andr notlimitation, as various and other forms of the devicejwill of course be apparent to those departing from the spirit of the invention or the seopek of the claims. t f Y i' of a supporting supporting positioning trunnions lintegral therewith,

means on said parallel members including pairs of spaced lugs, grate members" supported on said frame, said members each.'

gcoo'perative means, said headedmembersrelation with said t positioning engaged under certain of said'pairsof lugs land depending members spaced from said headed members and embraced by other pairs of said lugs,

pending members, said keys extendingunder said lugs for releasably securingsaid grate members in operative position.- i Y.

2. In a grate assembly, thelcombinationof a supporting frame, i V- v L spaced parallel members Vandsupporti-ng'r i. L. ltrunnions integral therewith, positioning-1Q ,Y j, f

lugs 22V sitioning shape Yin section, and as'v with' a marginal rib 62 extending around tlie `plateand havingbear- The plate is `off'course suitablyfor "maintaining it is to be under-4 'means on said parallel members provided on ativerrelation with said having inter-engagingrelationwith said pocertain of said locking membersand said positioning means for releasably securing said means, and means cooperating with` grateVV members yin operative position on said Y nions integral therewith, positioning lmeans on said frame includingypairs of `parallel Y grate assembly, the combination of a supporting frame,` said .frame having trun` having cooperative relationwithfsaid positioning means, said lockingmember includev ing headed members engagedundercertam depending membersA f j i l off'said pairs'k of lugs, spaced from'saidheadedfjmembers and eine bracedjby otherfpairs ofsaid lugs, andiremov- A i 'l i ablekeys in said depending members, said sition. 1

4. In a gratefassembly,the combination i 95st i,

ative relation .with said positioning means, i.

. p jdo keysextendingunder said lugs orreleasably secuiing'said.grateinembersin operative po# y 'i l said locking members including headed `mem- I bersengagedjunder certain of said positioning ineans,and depending. members spaced l" i* from said headed members and provided with a removableV member forenga'ging under l other ofsaid positioning vmeans'for releasably `securing said FREDERICK A; LoRENaJg;

and removable keys in said de-V Y said frame including i grate membersinvoperativ'e po- I Y r Signed at Chicago, Illinois, this Tthdayof February, 1929;l 1 v iiofj fils., .i 

